22
2. Technical data
SITRANS F M
Coil cable Electrode cable
Basic data No. of conductors 2 3
Min. sqr. area 0.5 mm
2
/20 gage 0.2 mm
2
/22 gage
Screen Yes Yes
Max. capacitance N.A. 350 pF/m / 107 pF/ft.
Max. cable loop Media temperature:
resistance < 100°C/< 210°F40 Ω N/A
< 200°C/< 390°F6 Ω N/A
Cable glands on sensor M20x1.5 gland - Cable ø 5-13 mm (0.20 - 0.51 Inch)
and transmitter: ½"NPT gland - Cable ø 5-9 mm (0.20 - 0.35 Inch)
2.8.1
Conductivity of medium
and sensor cables
Conductivity of Compact installation:
medium Liquids with an electrical conductivity ≥ 5 µS/cm.
Remote
installation:
Standard cable
2.8.2
Cable requirements
2.9
Cable data
(Supplied by Siemens
Flow Instruments)
Standard cable Special cable
(electrode/coil) (electrode)
Basic data No. of conductors 3 3
Sqr. area 1.5 mm
2
/18 gage 0.25 mm
2
/22 gage
Screen Yes Double
Color code Brown, blue, black Brown, blue, black
Outside color Grey Grey
Ext. diameter 7.8 mm/0,3" 8.1 mm/0,32"
Conductor Flexible CU Flexible CU
Isolation material PVC PVC
Amb. temperature Flexible installation −5 ... 70°C/− 23 ... 160°F −5 ... 70°C/−23 ... 160°F
Non-flexible installation −30 ... 70°C/−20 ... 160°F −30 ... 70°C/−20 ... 160°F
Cable parameter Capacity 161.50 pF/m / 49.24 pF/ft. N/A
Inductance 0.583 µH/m / 0.178 µH/ft. N/A
L/R 43.83 µH/Ω N/A
Special cable
Note
For detection of empty sensor the min. conductivity must always be >50 µS/cm a nd th e ma x. le ng th
of the electrode cable when remote mounted is 50 meters (164 ft). Special cable must be used!
For 19" Ex applications with safety barriers special cable cannot be used and the empty pipe
function can therefore not be used. For these applications 25 meters (82 ft) of cable can be used
in order to obtain 0.25% and 50 meters (164 ft) to obtain 0.5%.
For remote MID installations the max. cable length is 3 meters (9.8 ft). For other CT application
standard requirements are applicable.
Note
Empty sensor detection is not available with DN 2, 3 (1/12, 1/8 inch) sizes.
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